Novel Explicit Reference Governor-Based Adaptive Terminal Sliding Mode Control Design for Reentry Vehicles Equipped with Strapdown Seeker

This paper investigates an integrated guidance and control (IGC) strategy for reentry vehicles equipped with a strapdown seeker subject to the body line-of-sight (BLOS) angle constraint. A novel explicit reference governor-based IGC scheme is proposed to deal with BLOS angle constraint caused by strapdown mechanism. Taking the symmetric constraint interval as an example, the explicit reference governor is constructed for the positive and negative half intervals, respectively. The adaptive terminal sliding mode control (ATSMC) is subsequently designed for the IGC model to ensure that the closed-loop system tracks the commands of the explicit reference governor (ERG), thereby guaranteeing compliance with BLOS angle constraint. The stability of the closed-loop system is rigorously analyzed according to the Lyapunov stability theory. The numerical simulation results demonstrate the effectiveness of the proposed approach.